WORCESTER — A 22-year-old Shrewsbury man was seriously injured tonight when his motorcycle crashed into a car on Shrewsbury Street.

According to a witness to the accident, around 8:15 p.m., a black Saab 9-3 had the green arrow to go left onto Adams Street or make a U-turn. The witness said the Honda sportbike ran the red light and slammed into car. The force of the impact activated the car's side curtain air bags, and there appeared to be significant damage to the rear passenger door. The driver and passengers in the Saab did not appear to have suffered serious injuries.

Police said the man's injuries are serious but appear not to be life threatening. He was taken to UMass Memorial Medical Center — University Campus.

Police blocked off the right lane of Shrewsbury Street heading downtown as the accident reconstruction unit took photographs and collected evidence.